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The second-order statistics (SOS) can be applied in estimation of the purespectra of chemical components from the spectrum of their mixture, when SOSseems to be good at estimation of spectral patterns, but their peak directionsare opposite in some cases. In this paper, one method for judgment of the peakdirection of the pure spectra was proposed, where the base line of the purespectra was drawn by using their histograms and the peak directions were chosenso as to make all of the pure spectra located upwards over the base line.Results of the SOS analysis on the visible hyperspectral images of the mixturecomposed of two or three chemical components showed that the present methodoffered the reasonable shape and direction of the pure spectra of itscomponents.

Application of the Second-Order Statistics for Estimation of the Pure  Spectra of Individual Components from the Visible Hyperspectral Images of  Their Mixture